Get All of your Perks up to Level 5.

As a Medic, Kill 8 Specimens using a Knife in a Single Wave.

[2010 Xmas] Kill 2 Christmas Gorefasts with a Melee weapon from behind in one wave.

[2010 Xmas] Kill 3 Christmas Zeds in 1 ZED time chain with a Melee weapon.

Kill 4 Circus Zeds in 1 ZED time chain with a Melee weapon.

Transit - Get the Nitro to the Objective in 135 seconds or less

Get all 3 gold bars without the carriers taking damage while they have them

Obliterate 10 Zeds at once with the Pipe Bomb.

Kill 500 Zeds with the Schneidzekk Medic Gun while you are falling

Complete 10 Waves when the Rest of your Team has Died.

Transit - Pick up the door key

Win a short round on KF-Hell playing as or with Harchier Spebbington

Push a scrake back with the direct fire from a Hunting Shotgun or alt fire from the Multi-Chamber ZED Thrower

Kill a Halloween Fleshpound and Scrake in the same explosion with the Seal Squeal Harpoon Bomber or the LAW

Set a total of 200 Zeds on fire with the Trench Gun in Hillbilly Horror

Set 3 Hillbilly Gorefasts on fire with the Flare Pistol or Trench Gun

Survive 10 seconds after being screamed at by a Circus Siren on Hard or above.

Turn 500 Specimens into Giblets.

Turn 5 Fleshpounds into Giblets.

Unlock 10 of the 13 Christmas Achievements along with any Christmas Map achievement.

Unlock 10 of the 13 Circus Achievements along with any Abusement Park achievement.

Get all 6 achievements and unlock Commando Chicken

Complete a Long Game on all 3 Summer 2009 maps on Hard Difficulty.

Complete a Long Game on all 3 Summer 2009 maps on Normal Difficulty.